MAYON VOLCANO ADVISORY
11 November 2009
This is to notify the public and concerned authorities on the current activity of Mayon Volcano.
At 1:58 AM today, an ash explosion occurred at the summit crater of Mayon Volcano (13.2576 N, 123.6856 E). This event was recorded by the seismic network as explosion type earthquake which lasted for about three minutes and accompanied by rumbling sounds. Incandescent rock fragments at the upper slope were observed in Brgy. Lidong of Sto. Domingo, Brgys. Tumpa and Anoling of Camalig. Ash column was not observed due to cloud cover. Field investigation conducted after the event showed ashfall drifted towards the Southwest quadrant of the volcano due to the prevailing Northeast monsoon. Barangays affected by traces of ashfall were brgy. Tumpa of Camalig, Brgys. Travesia, Maipon, Masarawag, Doña Tumasa, Muladbukad Grande, and Pequeño of Guinobatan, Brgys. Nabonton and Nasisi of Ligao. Light ashfall was also noted at Brgy. San Rafael of Guinobatan. For the past 24 hours, the seismic network recorded twenty (20) volcanic earthquakes.
The status of Mayon Volcano remains at Alert Level 2. This means a state of unrest which could lead to more ash explosion or eventually to hazardous magmatic eruption. Thus PHIVOLCS strongly recommends that the 6-km radius Permanent Danger Zone (PDZ) around the volcano and the 7-km Extended Danger Zone (EDZ) on the southeast flank of the volcano are off-limits due to the threat from sudden explosions and rockfalls from the upper slope. Active river channels and those areas perennially identified as lahar prone in the southeast sector should also be avoided especially during bad weather condition or when there is heavy and prolonged rainfall.
In case of asfall, residents in affected areas should stay indoor or cover their nose with clean wet cloth or dust mask.
Any new development will be posted and relayed immediately to all concerned authorities.